#提示的信息是错误的。
x  = eval(input("请输入十个数字："))
sum = x
sum_2 = x**2
num = 10
for i in range(1,num):
    x = eval(input(""))
    sum += x
    sum_2 += x**2

print("均值为：",format((sum/num),".2f"))
print("方差为：",format(( (sum_2 - (sum**2)/num ) / (num-1) )**0.5,".2f") )